TITLE:   GCN CIRCULAR
NUMBER:  6350
SUBJECT: GRB 070411: Late-time Keck imaging
DATE:    07/04/25 18:49:50 GMT
FROM:    Daniel Perley at U.C. Berkeley  <dperley@astro.berkeley.edu>

D. A. Perley, J. S. Bloom, R. J. Foley, and D. Kocevski (UC Berkeley) 
report:

On the night of 2007 April 16 (UT) we imaged the field of GRB 070411 
(Moretti et al, GCN 6267) with Keck I / LRIS, in a series of g- and 
R-band exposures starting at 06:19 UT, 4.42 days after the GRB trigger 
under poor seeing conditions.  The afterglow (GCN 6267; Kann et al, GCN 
6268) is detected in a stacked image.  Calibrating relative to the same 
USNO-B star used by Garnavich et al (GCN 6346) at RA=7:09:23.35 
DEC=1:04:09.98, we measure an afterglow magnitude of R = 24.78 +/- 0.26.